Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd83984ee3b31bf…

MALICIOUS

PDF

86.2 KB Created: 2021-03-21 10:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b972c865f9d8cbae891022273ef67157 SHA-1: 80336d11eaca2281d8b52225ee71725592b1dd02 SHA-256: cdd83984ee3b31bfcc06eed1a12d77e75b47413a382ccd1aca6262ff5e3915cb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wix?keyword=vanilla+wow+holy+priest+guide PDF link annotation
    • http://hytri.com/jibejidoponolulurtavr.pdfIn PDF document text
    • https://cdn.sqhk.co/buzusodova/egihiii/dollar_general_digital_coupons_ads_and_more.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/ijhiojf/melijopomi.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/hgXifC9/87168595131.pdfIn PDF document text
    • http://nolubebizufusim.iblogger.org/dofomu.pdfIn PDF document text
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/fumalikobunonevapoz.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/hExhcSl/printable_word_search_puzzles_online_free_for_adults.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/35f9c77a29e.pdfIn PDF document text
    • http://copyrightnotices-form.com/fomenezuketomuzovapuoj9fg.pdfIn PDF document text
    • https://lupoleleki.weebly.com/uploads/1/3/4/5/134516255/8ad6268d.pdfIn PDF document text
    • https://dimafaxatabevex.weebly.com/uploads/1/3/5/9/135991177/a5800.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/haHVifK/pop_a_shot_mini_basketballs.pdfIn PDF document text
    • http://legiontry.online/cthulhu_through_the_ages_review3u9nq.pdfIn PDF document text
    • http://gtomishebs.xyz/6_hp_johnson_outboard_motor_fuel_mixtureroga0.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/b91cdbef9.pdfIn PDF document text
    • https://numezuledidi.weebly.com/uploads/1/3/4/0/134096646/sibemawisabipewe.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/lekozuzati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tananij.rf.gd/logitech_z_5300_drivers.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/9320030565.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 5380 bytes
SHA-256: b8f819c73457ba2026289f7f21cd47ada14aece52092240c38344fe7359ce81b
font_01_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 10820 bytes
SHA-256: eff2f6343b006c10d57c0fbccf40c13efa731073764221b0afd4f8309df5d995

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